AWWA M56

Nitrification Prevention and Control in Drinking Water

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Organization: AWWA
Publication Date: 1 January 2013
Status: active
Page Count: 320
scope:

INTRODUCTION

Nitrification is a microbiological process by which reduced nitrogen compounds (primarily ammonia) are sequentially oxidized to nitrite and nitrate (AWWA and EES 2002). Nitrification can be problematic in potable water systems that use chloramines for residual (or secondary) disinfection. The objectives of this manual are to:

• summarize existing knowledge and provide updated information on the current practices of water suppliers and issues related to nitrification;

• provide water utilities with the latest information on nitrification in water distribution systems;

• provide information to help utilities maintain a chloramine residual and overall water quality in tap water; and

• help utilities effectively prevent and mitigate nitrification episodes that may occur in their systems.

There are many sources that discuss the various aspects of nitrification. Several Water Research Foundation (WaterRF) reports discuss nitrification in conjunction with other topics, primarily drinking water disinfection and chloramination. Since the first writing of this manual, a better understanding of chloramination treatment, chloramine residual maintenance, and nitrification control within distribution systems has evolved. This understanding is a result of field experience, research, and pilot studies. For example, water utility personnel understand more fully how to form and monitor chloramine at carefully measured chlorine to ammonia ratios (usually 4.5 or 5.1 Cl2:NH3 -N) with minimal excess ammonia.

Document History

AWWA M56
January 1, 2013
Nitrification Prevention and Control in Drinking Water
INTRODUCTION Nitrification is a microbiological process by which reduced nitrogen compounds (primarily ammonia) are sequentially oxidized to nitrite and nitrate (AWWA and EES 2002). Nitrification...
January 1, 2006
Fundamentals and Control of Nitrification in Chloraminated Drinking Water Distribution Systems
Preface A group of volunteers from the Distribution Systems Water Quality Committee of the American Water Works Association prepared this manual of practice. The need for a manual on nitrification...

References

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